Implement the grid username mapping in XrdHttp

[ffurano]

The new config option

http.gridmap

allows to specify a gridmap file that is loaded at startup and used as in-memory username translator.

[jmuf]

These gridmap files change regularly - perhaps you could make sure that a new file will get loaded automatically at runtime, without requiring a full restart.

[ffurano]

Hi,
.. the reloading is supported, as It uses the gridmap functions given by XrdSec (which support it).
f

[ljanyst]

Hi Fabrizio,

this conflicts with master. Can you please have a look?

Cheers,
Lukasz